Looks like I didn't express myself well. I didn't mean that you were treating me like an idiot! I noticed a lot of people on other forums talking about this issue were patronizing those who had the issue raised.
I do believe you, Brian. Actually I am less worried now about this 'scratch'. Although there is some weird vertical part to it on the right side, but maybe that's what it is suppose to be. Not sure.
My other problem is that the camera came from focus adjustment in a way I didn't expect (or hoped for?). Now my central sensors are way out of focus with lots of chromatic aberration artifacts. It seems like focusing is worse now that it was before I sent the camera in